[Git][wxwidgets/wxwidgets][master] Make default background color transparent in wxOSX

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Vadim Zeitlin (@_VZ_)

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Jul 7, 2026, 3:06:55 PM (14 days ago) Jul 7
to wx-commi...@googlegroups.com

Vadim Zeitlin pushed to branch master at wxWidgets / wxWidgets

Commits:

  • 565553ee
    by Stefan Csomor at 2026-07-07T20:39:53+02:00 
    Make default background color transparent in wxOSX

This is needed for translucency effects, desktop background images
changing the toplevel window background tint.

Also don't erase background when no background color is specified.

Closes #26301.

2 changed files:

Changes:

  • include/wx/osx/window.h
    ... ... @@ -133,6 +133,14 @@ public:
    133 133
    134 134 
     #endif
    135 135
    136 
    +    virtual wxVisualAttributes GetDefaultAttributes() const override
    137 
    +    {
    138 
    +        return GetClassDefaultAttributes(GetWindowVariant());
    139 
    +    }
    140 
    +
    141 
    +    static wxVisualAttributes
    142 
    +    GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
    143 
    +
    136 144 
         // implementation from now on
    137 145 
         // --------------------------
    138 146

  • src/osx/window_osx.cpp
    ... ... @@ -1538,6 +1538,17 @@ wxWindowMac::AlwaysShowScrollbars(bool hflag, bool vflag)
    1538 1538 
             DoUpdateScrollbarVisibility();
    1539 1539 
     }
    1540 1540
    1541 
    +/* static */ wxVisualAttributes
    1542 
    +wxWindowMac::GetClassDefaultAttributes(wxWindowVariant variant)
    1543 
    +{
    1544 
    +    // it is important to return valid values for all attributes from here,
    1545 
    +    // GetXXX() below rely on this
    1546 
    +    wxVisualAttributes attrs = wxWindowBase::GetClassDefaultAttributes(variant);
    1547 
    +    attrs.colBg = wxTransparentColour;
    1548 
    +
    1549 
    +    return attrs;
    1550 
    +}
    1551 
    +
    1541 1552 
     //
    1542 1553 
     // we draw borders and grow boxes, are already set up and clipped in the current port / cgContextRef
    1543 1554 
     // our own window origin is at leftOrigin/rightOrigin
    ... ... @@ -2002,9 +2013,10 @@ bool wxWindowMac::MacDoRedraw( long time )
    2002 2013 
                         eevent.SetEventObject( this );
    2003 2014 
                         if ( ProcessWindowEvent( eevent ) )
    2004 2015 
                             break;
    2005 
    -
    2016 
    +#ifdef __WXOSX_IPHONE__
    2006 2017 
                         if (!UseBgCol())
    2007 2018 
                             dc.Clear();
    2019 
    +#endif
    2008 2020 
                     }
    2009 2021
    2010 2022 
                     if ( UseBgCol() )

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